A) \[\tau =\frac{\partial p{{r}^{2}}}{\partial x}\]
B) \[\tau =\frac{\partial p\left( r/2 \right)}{\partial x}\]
C) \[\tau =-\,\,\frac{\partial p\left( r/2 \right)}{\partial x}\]
D) \[\tau =\frac{\partial p\left( r \right)}{\partial x}\]
Correct Answer: C
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